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I managed to get it to work, the problem was that I didn't specify images for button and that is the reason why i wasn't in customize tab :sad_but_relieved_face:

 

m_sampleButton = controlDefs.AddButtonDefinition("Sastavnica", "Sastavnica", CommandTypesEnum.kShapeEditCmdType, AddInClientID,,, smallIcon, largeIcon)

smallIcon,largeIcon